岩石样品的静态酸中和能力评价

岩石的酸中和能力(acid neutralization capacity，ANC)是静态产酸预测中最具争议的一个重要参数.利用4种酸中和能力评价方法对山西省西山煤田石炭二叠纪含煤岩系的12个岩石样品进行了评价.研究表明，过滤的Sobek ANC方法能够有效消除反应性黄铁矿对ANC测定的影响，比修正的Sobek ANC方法计算的ANC值更准确；持续的Sobek ANC方法只对泥岩和黄铁矿样品具有一定的实际意义.矿物ANC计算法适宜评价冒泡反应强烈的灰岩和菱铁矿样品，而泥岩和砂岩的矿物ANC计算值不能反映样品的酸中和能力.灰岩和菱铁矿样品具有很强的酸中和能力，且ANC值不随时间变化；砂岩和泥岩的ANC值较低，其ANC值随时间逐渐降低. 

Evaluation of Acid Neutralization Capacity of Rocks

Acid neutralization capacity (ANC) of rocks is an important parameter of static acid generating prediction, and it is also the most controversial parameter. Twelve typical country rocks of Permo-Carboniferous coal-bearing measures from Xishan coal field at Shanxi Province are studied by four evaluation methods of acid neutralization capacity. Filtered Sobek ANC test can effectively eliminate effect of reactive pyrite for ANC determination. The ANC value based on filtered Sobek ANC test is more accurate than that of Modified Sobek ANC test. Sequential Sobek ANC tests are feasible for mudstone and pyrite samples. Mineralogical ANC method is more suitable for evaluating limestone and siderite samples with strong bubbling reaction, but not for mudstone and sandstone samples. The Mineralogical ANC value can't reflect the real acid neutralization capacity of mudstone and sandstone samples. Limestone and siderite samples have strong acid neutralization capacity, and the ANC values of samples do not change with time. Sandstone and mudstone samples have low ANC values, which decrease with time.